Gas-engine.



v G. P. LAW.

GAS ENGINE.

ArrLIuA'rroN FILED un. xe, 1910.

FI E E..

P D w /7///7//////7 atfomag un Mw GEORGE- P. LAW, 0F LANSING, MICHIGAN.

GAS-ENGINE.

Specification of Letters Patent.

Application led March 16, 1910. Serial No. 549,767.

To all whom it may concern:

Be it known that I, GEORGE P. LAW, a citizen of the United States, residing at Lansing, in the county of Ingham and State of Michigan, have invented certain new and useful Improvements in Gas-Engines; and -I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to gas engines; and it consists in the novel construction and combination of the parts hereinafter fully described and claimed whereby the air to support combustionl in the engine cylinder is heated by means of the-waste heat from the exhaust-pipe beforeV it enters the carbureter.

In the drawings, Figure 1 is a plan View of portions of a gas engine provided with an air-inlet pipe and an exhaust-pipe according to this invention. Fig. 2 is a side view of the air-inlet pipe.

-A is the power cylinder of a gas engine of any approved construction, and B is an exhaust-pi e whichmay be connected to any number ofp power cylinders. This exhaustpipe is heated by the waste products of combustion which are expelled through it.

C is a carbureter of any approved construction which is operatively connected with the cylinder or cylinders by a pipe or pipes c.

D is theair-inlet pipe `which is connected to the earbureter G, and d is a small plugvalve for the admission of cold air secured to a junction-piece d arranged between the air-inlet pipe and the carbureter. The airinlet pipe is secured around the exhaustpipe, and is connect/ed to the carbureter at about the middle of the length of the airinl t pipe by a branch e.

F are holesj for the air to enter at the endl portions of the air-inlet ipe and on the same side thereof as the ranch e. Parti-' tions g are arranged between the ipes B and D, and extend` circumferential y partway around the pipe B. These artitions are arranged on the same side o the airinlet pipe as the holes F and the branch e. TheA alrv passes spirally around the exhaustpipe in the direction of the arrows in the rawngs, and islheated by contact with the exhaust-pipe so that` it does more eective work in the carbureter and engine cylinder. The small plug-valve d can be opened more or less as required, by hand, to admit cold air, when the air in the air-inlet pipe is heated by the exhaust-pipe to an undesirably high temperature.

What I claim is :v

1. The combination, with the exhaust-pipe and the carbureter of a gas engine; of an air-inlet pipewhich encircles the said exhaust-pipe and which is provided atl its middle part -with a branch for connecting it to the carbureter, said air-inlet pipe having air-inlet holes in its end portions on the. same s ide as the said branch and having also eircumferentially arrangedV partitions extending partway around it between the said air-inlet holes and branch, air passages being formed between the said artitions and pipes on the opposite side o the air- .inlet pipe from its air-holes and outlet branch, whereby the air is caused to flow longitudinally and spirally in contact with' the exhaust pipe from each end of the airinlet pipe.

2; The combination, with the exhaustipe and the carbureter of a gas engine; o an air-inlet pipe which encircles the said exhaust-pipe and which has its middle portion connected to the said carbureter, said air-inlet pipe having air-inlet holes atits end portions, and a valve for admitting cold air arran ed at the'junction of the air-inlet pipe with t e carbureter.

Patented Got. 11, 1910.

In testimon vwhereof I have ailixed my signature in e presence of two witnesses.

GEORGE P. LAW. Witnesses:

ROBERT W. KOLLER,

EDWIN H. PORTER. 

